[jboss-jira] [JBoss JIRA] Created: (JGRP-1135) UNICAST: add piggybacking of acks

[Bela Ban (JIRA)]

UNICAST: add piggybacking of acks
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                 Key: JGRP-1135
                 URL: https://jira.jboss.org/jira/browse/JGRP-1135
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.10


For 2 sync RPCs between A and B, we have the following message exchange:

1: A --> DATA(15) --> B  // A sends the first request to B
2: A <-- ACK(15) <-- B     // B acks the request
3: A <-- DATA(27) <-- B   // B sends the response to A
4: A --> ACK(27) --> B    // A acks the response
5: A --> DATA(16) --> B  // A sends the second request to B
6: A <-- ACK(16) <-- B     // B acks the request
7: A <-- DATA(28) <-- B   // B sends the response to A
8: A --> ACK(28) --> B    // A acks the response

If we piggybacked acks, this would look as follows:

1: A --> DATA(15) --> B  // A sends the first request to B
2: A <-- DATA-ACK(27,15) <-- B   // B sends the response to A and acks A's request
3: A --> DATA(16,27) --> B  // A sends the second request to B and acks B's response
4: A <-- DATA(28,16) <-- B   // B sends the response to A and acks A's request
5: A --> ACK(28) --> B    // A acks the response

So instead of 8 exchanges, we have 5. Note, however, that *message bundling* might mitigate this somewhat and not send 8 requests ! This needs to be investigated further.



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